One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,15)(13,16)(17,18)(19,22)(20,23)(21,24)(25,28)(26,30)(27,31)(29,32) involution — undirected(2,5)(6,8)(9,11,14,10)(12,15,13,16)(17,19,21,26)(18,22,24,30)(20,27,28,32)(23,31,25,29)(9,12,14,13)(10,15,11,16)(18,23)(19,26)(20,28)(22,29)(24,25)(30,31)(9,12,14,13)(10,15,11,16)(19,26)(22,30)(27,32)(29,31)(1,3,4,7)(2,6,5,8)(9,13,14,12)(10,15,11,16)(18,24)(22,30)(23,25)(29,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.